A Mach meter presents the ratio of aircraft’s _______ .
A.indicated airspeed to the speed of sound
B.true airspeed to the speed of sound
C.equivalent airspeed to the speed of sound
D.either A or C
正确答案是B
A Mach meter presents the ratio of aircraft’s _______ .
A.indicated airspeed to the speed of sound
B.true airspeed to the speed of sound
C.equivalent airspeed to the speed of sound
D.either A or C
正确答案是B